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So I’ve got a 2011 Forester, n/a and it’s my first Subaru. Haven’t had problems up until lately. It started out as a small squealing sound that would only show up after a decent highway trip. I’d get off the highway and could hear the squealing. It almost sounds exactly like a belt squeal, and would kinda fade out once I slowed down to under 30mph. Now about a month later it’s almost there everytime I’m driving regardless of if the cars hot or cold. Any speed above 20or30 and it starts squealing. I can be driving at 45 and put the car in neutral and the rpms will drop but the squeal will stay the same, so I know it’s not the belt. It happened before and after putting all new brakes in, so I know it’s not the brakes. (I also had a cv shaft that was popping on turns that I replaced, and fixed it at first, but soon after it started popping again, but only when putting the car in reverse/drive when it’s cold. Not sure if that would have anything relevance to this situation.) But anyway. I’m not sure what to think. A wheel bearing is usually a low rumble, not a high squeal right? It’s to the point though that when I roll into the garage I can kinda hear a slight squeaking with rotation of the wheels. Sound is also louder when I’m coasting. If I’m going through a neighborhood and press the gas a little it’ll get a tad bit quieter, and then grow louder again when I let off. Any ideas? And maybe any ideas for the cv shaft also? Thanks for any info you guys can give me!
 

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2012 Forester X Auto
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Since the noise is independent of engine rpms, it is very likely a wheel/running gear issue., as you surmised.
You may notice it more when coasting due to less engine noise, so that may be a red herring.
Bearings can squeal as well as howl, but I'm thinking you might have a rock stuck in the brake caliper guard.
That can make an incredibly loud sound and the symptoms sound very similar to the situation I had, which was the cause in my case.
If you can isolate where the car is making the noise (get someone to help drive/listen) and lift that wheel, try rotating it to see if you can get any sound out of it.
 
2017 2.5i Fozy CVT
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It happened before and after putting all new brakes in, so I know it’s not the brakes.
"All new brakes ",,,means what, exactly?
  • Did you remove and clean the caliper slide pins and the bores they ride in,,,to include using SILICONE brake grease?
  • Have you checked them to make sure they are not dragging and pads are wearing evenly?
 
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